Zero-carbon farm house light storage heat co-supply system and control method

Abstract

The application relates to the technical field of new energy supply and building energy-saving control of rural houses, and discloses a zero-carbon rural house light-heat storage collaborative energy supply system and a control method, which comprises a roof distributed photovoltaic array, a lithium battery energy storage cabin, an intelligent energy dispatcher, an air source heat pump host, an integrated heat preservation water tank, a domestic hot water branch, a heating branch and a building envelope heat preservation unit. The intelligent energy dispatcher generates a photovoltaic direct drive mode, an energy storage energy supplement mode, a water tank heat storage mode and a power grid bottom-up mode according to photovoltaic power generation power, energy storage residual power, water tank heat storage state and rural house heat utilization state, controls the domestic hot water branch and the heating branch to take heat in stages, and corrects the heating supply parameters according to the heat loss of the building envelope. The application can improve the rationality of the distribution of the photovoltaic surplus electric energy between electric energy storage and heat storage, reduce the frequent start-stop of the air source heat pump host, and improve the overall operation stability of the rural house energy supply system.

Description

Technical Field

[0001] This invention relates to the field of new energy supply and building energy conservation control technology for rural housing, specifically a zero-carbon rural housing photovoltaic-thermal energy supply system and control method. Background Technology

[0002] With the development of clean heating, building energy conservation, and distributed new energy utilization in rural areas, the heating and domestic hot water systems of rural residences are gradually shifting from traditional coal-fired stoves and single electric heating equipment to a combination of air source heat pumps, rooftop photovoltaics, and energy storage devices. Air source heat pumps can extract low-grade heat energy from outdoor air and output hot water, rooftop distributed photovoltaic arrays can provide clean electricity for farmhouses, energy storage devices can buffer fluctuations in photovoltaic power generation, and building envelope insulation measures can reduce the heating load of farmhouses. Therefore, combining photovoltaic power generation, energy storage regulation, heat pump heating, and building envelope insulation in rural housing has become an important technological path to reduce energy costs and carbon emissions in rural housing.

[0003] However, existing rural housing energy supply solutions typically configure rooftop photovoltaics, energy storage devices, air source heat pumps, water tank heating, and building envelope insulation as relatively independent equipment or structures. They lack a unified control method for scheduling based on photovoltaic power generation, remaining energy storage capacity, water tank heat storage status, domestic hot water demand, heating demand, and building envelope heat loss. This results in surplus photovoltaic power not being prioritized for rational allocation between electrical and thermal energy storage, frequent start-stop or high-power operation of the air source heat pump unit, and difficulty in tiered heating between domestic hot water and heating branches according to different heating temperatures. Ultimately, this affects the self-consumption capacity of photovoltaics, heating stability, and the overall energy-saving effect of rural housing. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a zero-carbon rural housing photovoltaic-storage-thermal energy supply system and control method. This system solves the problems of insufficient utilization of surplus photovoltaic power, unstable operation of the air source heat pump unit, and difficulty in providing domestic hot water and heating in the existing rural housing energy supply schemes due to the lack of coordinated control among photovoltaic power generation, energy storage regulation, air source heat pump heating, water tank heat storage, domestic hot water supply, heating supply and building envelope insulation.

[0005] In this invention, a zero-carbon farmhouse refers to a farmhouse that, under design conditions, achieves a balance between its annual cumulative clean power generation and annual cumulative electricity consumption through the coordinated operation of a rooftop distributed photovoltaic array, a lithium battery energy storage chamber, an air source heat pump unit, an integrated insulated water tank, and an enclosure insulation unit, or a farmhouse whose annual carbon emission accounting result approaches zero.

[0006] The technical solution of this invention does not simply list the rooftop distributed photovoltaic array, lithium battery energy storage compartment, air source heat pump host, integrated insulated water tank and building envelope insulation unit in parallel. Instead, it incorporates the photovoltaic energy supply status, energy storage energy supply status, water tank heat storage status, rural housing heat use status and building envelope heat loss into the same scheduling framework, and uses the building envelope heat loss as an active control parameter to participate in the operation of the air source heat pump host and the correction of heating parameters of the heating branch.

[0007] To address the aforementioned technical problems, this invention provides a control method for the coordinated photovoltaic, thermal energy storage, and energy supply of zero-carbon rural houses. This method is applied to a coordinated photovoltaic, thermal energy storage, and energy supply system for zero-carbon rural houses. The system includes a rooftop distributed photovoltaic array, a lithium battery energy storage compartment, an air-source heat pump unit, an integrated insulated water tank, domestic hot water branches, heating branches, an insulation unit for the building envelope, a power grid backup unit, and an intelligent energy dispatcher. The control method includes the following steps:

[0008] The intelligent energy dispatcher collects the photovoltaic power generation of the rooftop distributed photovoltaic array, the remaining energy storage capacity of the lithium battery energy storage compartment, the outdoor ambient temperature, the indoor ambient temperature, the upper temperature of the integrated insulated water tank, the lower temperature of the integrated insulated water tank, domestic hot water demand information, heating demand information, the heat pump operation status of the air source heat pump host, and the grid connection status of the grid backup unit, and obtains the heat transfer coefficient and area of ​​the building envelope insulation unit.

[0009] The photovoltaic power generation power is used to determine the photovoltaic power supply status, the energy storage power supply status is used to determine the remaining energy storage power, the water tank heat storage status is used to determine the upper and lower temperatures of the water tank, the rural house heating status is used to determine the outdoor ambient temperature, the indoor ambient temperature, the domestic hot water demand information, and the heating demand information, and the building envelope heat loss is determined based on the heat transfer coefficient of the building envelope, the area of ​​the building envelope, and the temperature difference between the indoor and outdoor ambient temperatures.

[0010] Based on the photovoltaic power supply status, the energy storage power supply status, the water tank heat storage status, and the rural housing heating status, at least one of the following operating modes is generated: photovoltaic direct drive mode, energy storage supplementary mode, water tank heat storage mode, and power grid backup mode.

[0011] In the photovoltaic direct drive mode, the rooftop distributed photovoltaic array is controlled to supply power to the air source heat pump host, so that the air source heat pump host supplies heat to the integrated insulated water tank;

[0012] In the energy storage and replenishment mode, the lithium battery energy storage compartment is controlled to supplement the power supply to the air source heat pump host, so that the air source heat pump host continues to supply heat to the integrated insulated water tank;

[0013] In the water tank heat storage mode, the air source heat pump host is controlled to increase the heat supply to the integrated insulated water tank, converting surplus photovoltaic power into water tank heat storage.

[0014] In the grid backup mode, the grid backup unit is controlled to supplement the power supply to the air source heat pump host, and the heating priority of the air source heat pump host is limited according to the domestic hot water demand information and the heating demand information.

[0015] Based on the domestic hot water demand information, the domestic hot water branch is controlled to extract heat from the integrated insulated water tank, and based on the heating demand information, the heating branch is controlled to extract heat from the integrated insulated water tank.

[0016] The heating parameters of the heating branch are corrected based on the heat loss of the building envelope.

[0017] Furthermore, generating at least one operating mode among the photovoltaic direct drive mode, the energy storage supplementary mode, the water tank thermal storage mode, and the grid backup mode includes:

[0018] When the photovoltaic power generation meets the current operating power requirements of the air source heat pump host, the photovoltaic direct drive mode is generated;

[0019] When the photovoltaic power generation is greater than the current operating power requirement of the air source heat pump host, and the remaining energy storage power is lower than the preset energy storage upper limit, the photovoltaic direct drive mode is generated, and the surplus photovoltaic power is controlled to charge the lithium battery energy storage compartment first.

[0020] When the photovoltaic power generation is greater than the current operating power requirement of the air source heat pump host, the remaining energy storage power is not lower than the preset energy storage upper limit or the charging power of the lithium battery energy storage compartment is limited, and the integrated insulated water tank is in a state of insufficient heat storage, the water tank heat storage mode is generated.

[0021] When the photovoltaic power generation is less than the current operating power requirement of the air source heat pump host, and the remaining energy storage power is higher than the preset energy storage lower limit, the energy storage replenishment mode is generated.

[0022] When the photovoltaic power generation is less than the current operating power requirement of the air source heat pump host, and the remaining energy storage power is not higher than the preset energy storage lower limit, the grid backup mode is generated.

[0023] Furthermore, in the water tank heat storage mode, the intelligent energy dispatcher determines the heat storage capacity of the integrated insulated water tank based on the upper temperature of the water tank, the lower temperature of the water tank, and the preset heat storage temperature. When the heat storage capacity is greater than the preset heat storage capacity, and the rooftop distributed photovoltaic array has surplus photovoltaic power, the air source heat pump host is controlled to increase the compressor operating frequency and the integrated insulated water tank is controlled to perform stratified heat storage. When the upper temperature of the water tank reaches the preset domestic hot water temperature, and the lower temperature of the water tank does not reach the preset heating heat storage temperature, the air source heat pump host is controlled to maintain heat storage in the middle and lower parts of the integrated insulated water tank. When the upper temperature of the water tank reaches the preset domestic hot water temperature, and the lower temperature of the water tank reaches the preset heating heat storage temperature, the compressor operating frequency of the air source heat pump host is reduced or the air source heat pump host is stopped.

[0024] Furthermore, the integrated insulated water tank is equipped with an upper temperature detection point and a lower temperature detection point. The upper temperature detection point is used to detect the water temperature in the domestic hot water supply area, and the lower temperature detection point is used to detect the water temperature in the heating and heat storage area. The integrated insulated water tank has a domestic hot water outlet at the top, a heating water supply outlet at the middle and lower part, and a heating return outlet at the bottom, so that the integrated insulated water tank forms a layered heat use structure with priority supply of domestic hot water at the top and heating and heat storage supply at the middle and lower parts.

[0025] Furthermore, controlling the domestic hot water branch to draw heat from the integrated insulated water tank based on the domestic hot water demand information, and controlling the heating branch to draw heat from the integrated insulated water tank based on the heating demand information, includes:

[0026] When the domestic hot water demand information indicates that there is a domestic hot water demand, the domestic hot water branch is controlled to extract heat from the top of the integrated insulated water tank, and the operating status of the domestic hot water circulation pump and the opening of the domestic hot water regulating valve of the domestic hot water branch are adjusted according to the temperature of the top of the water tank.

[0027] When the heating demand information indicates that there is a heating demand, the heating branch is controlled to extract heat from the lower middle part of the integrated insulated water tank, and the operating status of the heating circulation pump and the opening degree of the heating regulating valve of the heating branch are adjusted according to the temperature of the lower part of the water tank, the indoor ambient temperature and the outdoor ambient temperature.

[0028] When both the domestic hot water demand information and the heating demand information indicate a heating demand, priority is given to ensuring the outlet water temperature of the domestic hot water branch, and then the water supply flow of the heating branch is adjusted according to the remaining heat storage capacity of the integrated insulated water tank.

[0029] Furthermore, the heating parameters of the heating branch are corrected based on the heat loss of the building envelope corresponding to the building envelope insulation unit, including:

[0030] The heat loss of the building envelope is determined based on the heat transfer coefficient of the building envelope insulation unit, the area of ​​the building envelope, and the temperature difference between the indoor and outdoor ambient temperatures. The heat loss of the building envelope is then corrected by taking into account the decrease in the indoor ambient temperature per unit time.

[0031] When the heat loss of the building envelope is lower than the preset heat loss threshold, the heating water supply temperature of the heating branch or the water supply flow rate of the heating branch is reduced.

[0032] When the heat loss of the building envelope is not lower than the preset heat loss threshold, the heating water supply temperature of the heating branch or the water supply flow rate of the heating branch is increased.

[0033] Furthermore, the condenser has a refrigerant inlet, a refrigerant outlet, a water-side inlet, and a water-side outlet. The refrigerant inlet is located at the upper part of the condenser, the refrigerant outlet is located at the lower part of the condenser, the water-side inlet is located at the lower part of the condenser, and the water-side outlet is located at the upper part of the condenser, so that the refrigerant entering the condenser and the water entering the condenser form a countercurrent heat exchange.

[0034] Furthermore, when the outdoor ambient temperature is lower than the preset low-temperature protection temperature, the remaining energy storage capacity and the heat storage status of the water tank are determined; when the remaining energy storage capacity is higher than the preset low-temperature discharge threshold, and the heat storage status of the water tank indicates that the integrated insulated water tank has usable heat storage capacity, the lithium battery energy storage compartment and the integrated insulated water tank are controlled to jointly maintain the basic heating of the domestic hot water branch and the heating branch; when the remaining energy storage capacity is not higher than the preset low-temperature discharge threshold, or the heat storage status of the water tank indicates that the integrated insulated water tank has no usable heat storage capacity, the power grid backup unit is controlled to supply power to the air source heat pump host, and the air source heat pump host is controlled to perform low-temperature supplementary heating operation.

[0035] This invention also provides a zero-carbon rural housing photovoltaic-storage-thermal energy supply system, including a rooftop distributed photovoltaic array, a lithium battery energy storage compartment, an air source heat pump unit, an integrated insulated water tank, domestic hot water branch circuits, heating branch circuits, building envelope insulation unit, power grid backup unit, and intelligent energy dispatcher.

[0036] The rooftop distributed photovoltaic array is electrically connected to the lithium battery energy storage compartment and the air source heat pump unit, respectively.

[0037] The lithium battery energy storage compartment is electrically connected to the air source heat pump main unit.

[0038] The power grid backup unit is electrically connected to the air source heat pump main unit;

[0039] The air source heat pump unit is thermally connected to the integrated insulated water tank;

[0040] The integrated insulated water tank is connected to both the domestic hot water branch and the heating branch.

[0041] The insulation unit of the building envelope is installed in the building envelope of the farmhouse.

[0042] The intelligent energy dispatcher is communicatively connected to the rooftop distributed photovoltaic array, the lithium battery energy storage compartment, the air source heat pump unit, the integrated insulated water tank, the domestic hot water branch, the heating branch, and the power grid backup unit.

[0043] The intelligent energy dispatcher is configured to: generate at least one of the following operating modes based on the photovoltaic power generation, the remaining energy storage capacity, the water tank heat storage status, and the rural housing heating status: photovoltaic direct drive mode, energy storage supplement mode, water tank heat storage mode, and power grid backup mode; control the domestic hot water branch and the heating branch to extract heat in stages; and correct the heating parameters of the heating branch based on the heat loss of the building envelope.

[0044] The intelligent energy scheduler is used to execute the above-mentioned zero-carbon rural housing photovoltaic-storage-thermal collaborative energy supply control method.

[0045] Furthermore, the air source heat pump unit includes a refrigerant circuit, which includes a compressor, a condenser, a dryer filter, an expansion valve, and an evaporator. The compressor, the condenser, the dryer filter, the expansion valve, and the evaporator are connected in sequence, and the dryer filter is located on the refrigerant inlet side of the expansion valve.

[0046] Furthermore, the condenser has a refrigerant inlet, a refrigerant outlet, a water-side inlet, and a water-side outlet. The refrigerant inlet is located at the upper part of the condenser, the refrigerant outlet is located at the lower part of the condenser, the water-side inlet is located at the lower part of the condenser, and the water-side outlet is located at the upper part of the condenser, so that the refrigerant entering the condenser and the water entering the condenser form a countercurrent heat exchange.

[0047] This invention provides a zero-carbon rural housing solar-storage-thermal energy supply system and control method. It has the following beneficial effects:

[0048] This invention uses an intelligent energy dispatcher to uniformly collect photovoltaic power generation, remaining energy storage capacity, water tank heat storage status, domestic hot water demand, heating demand, and building envelope heat loss. Based on this information, it generates photovoltaic direct drive mode, energy storage supplement mode, water tank heat storage mode, and grid backup mode. This enables the rooftop distributed photovoltaic array, lithium battery energy storage compartment, air source heat pump host, integrated insulated water tank, domestic hot water branch, heating branch, and building envelope insulation unit to form a coordinated control relationship. This improves the rationality of the allocation of surplus photovoltaic power between electrical and thermal energy storage, reduces the frequent start-stop of the air source heat pump host, and improves the overall operational stability of the rural housing energy supply system.

[0049] This invention transforms the heat loss of the building envelope from a passive insulation result into an active control input of an intelligent energy dispatcher, enabling the heating parameters of the heating branches to be corrected according to the actual heat loss of the building envelope. This avoids overheating in farmhouses with good insulation performance and underheating in farmhouses with large heat loss.

[0050] This invention sets up a photovoltaic direct-drive mode, an energy storage supplement mode, a water tank heat storage mode, and a grid backup mode. When the photovoltaic power generation meets the demand, the photovoltaic direct-drive air source heat pump host is used first. When the photovoltaic power generation is insufficient, the lithium battery energy storage compartment provides supplementary power. When the lithium battery energy storage compartment reaches the preset energy storage limit or the charging power is limited, the surplus photovoltaic power is converted into water tank heat storage. When neither photovoltaic nor energy storage can meet the demand, the grid backup unit provides supplementary power. This allows the system to adapt to different power supply states during the day, night, rainy weather, and low temperature conditions.

[0051] Among them, the water tank heat storage mode serves as the second-level buffer for surplus photovoltaic power. When the lithium battery energy storage compartment reaches the preset energy storage limit or the charging power is limited, the surplus photovoltaic power is converted into water tank heat storage through the air source heat pump host, thus forming a two-level buffer mechanism with priority given to electrical energy storage and thermal energy storage as a backup.

[0052] This invention utilizes an integrated insulated water tank to create a tiered heat supply structure, prioritizing the supply of domestic hot water at the top and providing heating and heat storage in the middle and lower sections. This allows domestic hot water branches to draw heat from the top of the integrated insulated water tank, while heating branches draw heat from the middle and lower sections. When both domestic hot water and heating demand information are present, priority is given to ensuring the outlet water temperature of the domestic hot water branches, thereby achieving tiered heating for domestic hot water and heating and preventing the air source heat pump unit from operating under a single high-temperature demand for extended periods.

[0053] This invention corrects the heating water supply temperature or flow rate of the heating branch according to the heat loss of the building envelope corresponding to the building envelope insulation unit. This makes the building envelope insulation unit no longer just a static insulation structure, but an intelligent energy dispatcher that corrects the thermal boundary conditions of the heating load and participates in active heating control, thereby reducing the heating load of rural houses and improving the synergistic energy-saving effect between active energy supply and passive insulation.

[0054] This invention, by placing a drying filter in the refrigerant circuit of the air source heat pump unit on the refrigerant inlet side of the expansion valve, can filter and dry the refrigerant before it enters the expansion valve, reducing the risk of blockage of the expansion valve due to impurities, moisture or ice crystals, thereby improving the operational reliability of the air source heat pump unit in low-temperature environments.

[0055] This invention, by placing the refrigerant inlet at the top of the condenser, the refrigerant outlet at the bottom, the water inlet at the bottom, and the water outlet at the top, enables the refrigerant entering the condenser to exchange heat with the water entering the condenser in a counter-current manner. This is beneficial for improving the heat exchange efficiency of the condenser and the heating stability of the integrated insulated water tank.

[0056] This invention improves the system's ability to guarantee domestic hot water and heating under extreme low-temperature conditions by judging the remaining power of the energy storage and the heat storage status of the water tank when the outdoor ambient temperature is lower than the preset low-temperature protection temperature, and controlling the lithium battery energy storage compartment, the integrated insulated water tank and the power grid backup unit to jointly maintain basic heating or perform low-temperature supplementary heating operation based on the judgment results. Attached Figure Description

[0057] Figure 1 This is a schematic diagram of the structure of a zero-carbon rural housing solar-thermal energy supply system according to the present invention;

[0058] Figure 2 This is a schematic diagram of the working principle of the air source heat pump host and the cross-sectional structure of the insulation unit of the building envelope of the present invention.

[0059] Figure 3 This is a flowchart illustrating the zero-carbon rural housing solar-storage-thermal energy supply control method of the present invention.

[0060] Figure 4 This is a schematic diagram of the refrigerant circuit and counter-current heat exchange structure of the air source heat pump main unit of the present invention;

[0061] Figure 5 This is a schematic diagram of the coupling structure between the air source heat pump host, the rooftop distributed photovoltaic array, and the lithium battery energy storage compartment of the present invention.

[0062] Figure 6 This is a schematic diagram of the source-storage-load coordinated control of the intelligent energy dispatcher of the present invention.

[0063] The components include: 1. Rooftop distributed photovoltaic array; 2. Lithium battery energy storage compartment; 3. Intelligent energy dispatcher; 4. Air source heat pump unit; 5. Integrated insulated water tank; 6. Domestic hot water branch circuit; 7. Heating branch circuit; and 8. Envelope insulation unit. Detailed Implementation

[0064] The present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the following embodiments are used to illustrate the technical solution of the present invention and are not intended to limit the scope of protection of the present invention. Without departing from the concept of the present invention, those skilled in the art can routinely adjust the capacity, model, installation location, pipeline connection method and control threshold of each component according to the farmhouse area, roof area, heating load, domestic hot water load, local climate conditions and electricity conditions.

[0065] like Figures 1 to 6 As shown, this embodiment provides a zero-carbon rural house solar-energy storage-thermal energy supply system. The system includes a rooftop distributed photovoltaic array 1, a lithium battery energy storage compartment 2, an intelligent energy dispatcher 3, an air-source heat pump unit 4, an integrated insulated water tank 5, domestic hot water branch lines 6, heating branch lines 7, and an insulation unit for the building envelope 8. The rooftop distributed photovoltaic array 1 is installed on the roof of the rural house to convert solar energy into electrical energy. The lithium battery energy storage compartment 2 is electrically connected to the rooftop distributed photovoltaic array 1 to receive surplus electricity generated by the rooftop distributed photovoltaic array 1 and to supplement power to the air-source heat pump unit 4 when the output of the rooftop distributed photovoltaic array 1 is insufficient. The intelligent energy dispatcher 3 is communicatively connected to the rooftop distributed photovoltaic array 1, the lithium battery energy storage compartment 2, the air-source heat pump unit 4, the integrated insulated water tank 5, the domestic hot water branch lines 6, and the heating branch lines 7, respectively, to collect system operation data and output control commands. The air-source heat pump unit 4 is thermally connected to the integrated insulated water tank 5 to extract low-grade heat energy from the outdoor air and output heat to the integrated insulated water tank 5. The integrated insulated water tank 5 is connected to both the domestic hot water branch 6 and the heating branch 7, and is used to buffer, store, and distribute the heat output by the air source heat pump unit 4. The building envelope insulation unit 8 is installed in the building envelope of the farmhouse to reduce heat transfer loss in the building envelope.

[0066] In this embodiment, the zero-carbon rural housing photovoltaic-storage-thermal energy supply system also includes a grid backup unit. This grid backup unit, not separately labeled in the accompanying drawings, includes a grid connection interface, a distribution switch, and an AC power supply line. It is used to supplement power to the air source heat pump unit 4 when the rooftop distributed photovoltaic array 1 and the lithium battery energy storage compartment 2 cannot meet the operating requirements of the air source heat pump unit 4. The grid backup unit is communicatively connected to the intelligent energy dispatcher 3. The intelligent energy dispatcher 3 controls the connection or disconnection of the grid backup unit based on the photovoltaic power generation, remaining energy storage capacity, water tank thermal storage status, and rural housing heating status.

[0067] The electricity generated by the rooftop distributed photovoltaic array 1 is preferentially supplied to the air source heat pump unit 4 for operation. For example... Figure 5 As shown, the rooftop distributed photovoltaic array 1, lithium battery energy storage compartment 2, air source heat pump unit 4, and integrated insulated water tank 5 form a coupled structure integrating photovoltaic power generation, energy storage regulation, heat pump heating, and water tank heat storage. The electricity generated by the rooftop distributed photovoltaic array 1 powers the air source heat pump unit 4; surplus photovoltaic electricity is stored in the lithium battery energy storage compartment 2; and the heat output from the air source heat pump unit 4 is transferred to the integrated insulated water tank 5, which then supplies heat to the domestic hot water branch 6 and the heating branch 7. Figure 6 As shown, the intelligent energy dispatcher 3 establishes control relationships with the rooftop distributed photovoltaic array 1, the lithium battery energy storage compartment 2, the air source heat pump host 4, and the integrated insulated water tank 5, respectively. Based on the photovoltaic power generation of the rooftop distributed photovoltaic array 1, the remaining energy stored in the lithium battery energy storage compartment 2, the heat pump operation status of the air source heat pump host 4, and the water tank heat storage status of the integrated insulated water tank 5, the intelligent energy dispatcher 3 controls the rooftop distributed photovoltaic array 1 to directly supply power to the air source heat pump host 4, controls surplus photovoltaic energy to charge the lithium battery energy storage compartment 2, controls the lithium battery energy storage compartment 2 to supplement power to the air source heat pump host 4, and controls the air source heat pump host 4 to supplement heat to the integrated insulated water tank 5 based on the temperature status of the domestic hot water supply area and the heating heat storage area of ​​the integrated insulated water tank 5.

[0068] When the electricity generated by the rooftop distributed photovoltaic array 1 exceeds the current operating power requirement of the air source heat pump host 4, the intelligent energy dispatcher 3 prioritizes determining whether the lithium battery energy storage compartment 2 is allowed to charge. When the lithium battery energy storage compartment 2 is allowed to charge, the intelligent energy dispatcher 3 controls the excess photovoltaic electricity to enter the lithium battery energy storage compartment 2; when the lithium battery energy storage compartment 2 reaches the preset energy storage upper limit or the charging power is limited, and the integrated insulated water tank 5 still has heat storage capacity, the intelligent energy dispatcher 3 controls the air source heat pump host 4 to enter the water tank heat storage mode, so that the excess photovoltaic electricity is converted into water tank heat storage. Through the above method, the system forms a working mode of coordinated operation of electrical energy storage and thermal energy storage, reducing photovoltaic power curtailment and reducing the frequent start-stop of the air source heat pump host 4.

[0069] The lithium battery energy storage compartment 2 includes a battery pack, a battery management system, and a bidirectional converter unit. The battery management system is used to detect the voltage, current, temperature, and remaining energy capacity of the battery pack. The bidirectional converter unit is used to realize energy conversion between the rooftop distributed photovoltaic array 1, the lithium battery energy storage compartment 2, and the air source heat pump host 4. The intelligent energy dispatcher 3 controls the charging, discharging, and standby states of the lithium battery energy storage compartment 2 based on the remaining energy capacity. When the remaining energy capacity is lower than the preset upper limit and the rooftop distributed photovoltaic array 1 has surplus photovoltaic power, the intelligent energy dispatcher 3 controls the lithium battery energy storage compartment 2 to charge; when the remaining energy capacity is higher than the preset lower limit and the rooftop distributed photovoltaic array 1 has insufficient output, the intelligent energy dispatcher 3 controls the lithium battery energy storage compartment 2 to supplement power to the air source heat pump host 4; when the remaining energy capacity is not higher than the preset lower limit, the intelligent energy dispatcher 3 limits the lithium battery energy storage compartment 2 from continuing to discharge in order to protect the battery pack and retain basic emergency power.

[0070] The intelligent energy dispatcher 3 is used to collect data on the photovoltaic power generation of the rooftop distributed photovoltaic array 1, the remaining energy storage capacity of the lithium battery energy storage compartment 2, the outdoor ambient temperature, the indoor ambient temperature, the upper temperature of the integrated insulated water tank 5, the lower temperature of the integrated insulated water tank 5, domestic hot water demand information, heating demand information, the heat pump operation status of the air source heat pump host 4, and the grid connection status of the grid backup unit. The domestic hot water demand information is determined by the flow sensor, water temperature sensor, or the on / off status of the water outlet of the domestic hot water branch 6; the heating demand information is determined by the indoor ambient temperature, the target indoor temperature, the return water temperature of the heating branch 7, and the operation status of the heating terminal; the upper temperature of the water tank reflects the temperature of the domestic hot water supply area in the integrated insulated water tank 5, and the lower temperature of the water tank reflects the temperature of the heating storage area in the integrated insulated water tank 5.

[0071] The integrated insulated water tank 5 is equipped with upper and lower temperature detection points. The upper temperature detection point is used to detect the water temperature in the domestic hot water supply area, and the lower temperature detection point is used to detect the water temperature in the heating and heat storage area. The integrated insulated water tank 5 has a domestic hot water outlet at the top, a heating water supply inlet in the middle and lower part, and a heating water return inlet at the bottom, creating a tiered heat supply structure where domestic hot water is prioritized at the top and heating and heat storage in the middle and lower part is supplied. The domestic hot water branch 6 is connected to the domestic hot water outlet, and the heating branch 7 is connected to both the heating water supply and return inlets. The domestic hot water branch 6 is equipped with a domestic hot water circulation pump and a domestic hot water regulating valve, and the heating branch 7 is equipped with a heating circulation pump and a heating regulating valve. The intelligent energy dispatcher 3 controls the operating status of the domestic hot water circulation pump, the domestic hot water regulating valve, the heating circulation pump, and the heating regulating valve, respectively.

[0072] The air source heat pump unit 4 includes a refrigerant circuit, which comprises a compressor, condenser, dryer filter, expansion valve, and evaporator. The compressor, condenser, dryer filter, expansion valve, and evaporator are connected sequentially, with the dryer filter located on the refrigerant inlet side of the expansion valve. The compressor compresses the low-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant; the condenser facilitates heat exchange between the high-temperature, high-pressure gaseous refrigerant and water, causing the refrigerant to release heat and liquefy, thus raising the water temperature; the dryer filter filters impurities, moisture, and ice crystals from the refrigerant, reducing the risk of expansion valve blockage or ice blockage; the expansion valve throttles and reduces the pressure of the liquid refrigerant; and the evaporator allows the low-temperature, low-pressure refrigerant to absorb low-grade heat energy from the outdoor air and evaporate into a gaseous refrigerant.

[0073] In a preferred embodiment, the condenser employs a counter-current heat exchange arrangement. The condenser has a refrigerant inlet, a refrigerant outlet, a water-side inlet, and a water-side outlet. The refrigerant inlet is located at the top of the condenser, the refrigerant outlet at the bottom, the water-side inlet at the bottom, and the water-side outlet at the top. High-temperature, high-pressure gaseous refrigerant enters from the top of the condenser and flows out from the bottom, while the water to be heated enters from the bottom and flows out from the top, creating a counter-current heat exchange between the refrigerant and the water entering the condenser. This counter-current heat exchange arrangement increases the average temperature difference between the refrigerant and water, improves the condenser's heat exchange efficiency, and enhances the stability of the inlet water heating in the integrated insulated water tank 5.

[0074] The building envelope insulation unit 8 is configured as a multi-layer composite insulation structure, comprising an exterior wall base layer, an interface treatment layer, a sprayed insulation layer, a reinforcement layer, a plaster layer, and a finishing layer. The exterior wall base layer provides the load-bearing foundation; the interface treatment layer enhances the bond strength between the sprayed insulation layer and the exterior wall base layer; the sprayed insulation layer reduces heat transfer loss within the building envelope; the reinforcement layer improves the crack resistance of the wall surface; the plaster layer forms a protective layer; and the finishing layer provides external surface protection and decoration. The building envelope insulation unit 8, acting as the intelligent energy dispatcher 3, calculates the heating load and corrects the heating parameters of the heating branch 7, enabling the passive insulation structure to work in conjunction with the active energy supply system.

[0075] This embodiment also provides a zero-carbon rural housing solar-storage-thermal energy supply control method, which is executed by an intelligent energy dispatcher 3 and includes the following steps.

[0076] S1. The intelligent energy dispatcher 3 collects the photovoltaic power generation of the rooftop distributed photovoltaic array 1, the remaining energy storage capacity of the lithium battery energy storage compartment 2, the outdoor ambient temperature, the indoor ambient temperature, the upper temperature of the integrated insulated water tank 5, the lower temperature of the integrated insulated water tank 5, the domestic hot water demand information, the heating demand information, the heat pump operation status of the air source heat pump host 4, and the grid connection status of the grid backup unit, and obtains the heat transfer coefficient and area of ​​the building envelope insulation unit 8.

[0077] S2. Determine the photovoltaic power supply status based on the photovoltaic power generation capacity, determine the energy storage power supply status based on the remaining energy storage capacity, determine the water tank heat storage status based on the temperature at the top and bottom of the water tank, determine the rural house heating status based on the outdoor ambient temperature, indoor ambient temperature, domestic hot water demand information, and heating demand information, and determine the heat loss of the building envelope based on the heat transfer coefficient of the building envelope, the area of ​​the building envelope, and the temperature difference between the indoor and outdoor ambient temperatures.

[0078] Specifically, when the photovoltaic power generation is not lower than the current operating power requirement of the air source heat pump host 4, the intelligent energy dispatcher 3 determines the photovoltaic energy supply status as photovoltaic satisfied; when the photovoltaic power generation is lower than the current operating power requirement of the air source heat pump host 4, the intelligent energy dispatcher 3 determines the photovoltaic energy supply status as photovoltaic insufficient. When the remaining energy storage capacity is higher than the preset energy storage lower limit, the intelligent energy dispatcher 3 determines the energy storage supply status as energy storage dischargeable; when the remaining energy storage capacity is not higher than the preset energy storage lower limit, the intelligent energy dispatcher 3 determines the energy storage supply status as energy storage limited. When the temperature at the top of the water tank is lower than the preset domestic hot water temperature, or the temperature at the bottom of the water tank is lower than the preset heating and heat storage temperature, the intelligent energy dispatcher 3 determines the water tank heat storage status as heat storage insufficient; when the temperature at the top of the water tank is not lower than the preset domestic hot water temperature, and the temperature at the bottom of the water tank is not lower than the preset heating and heat storage temperature, the intelligent energy dispatcher 3 determines the water tank heat storage status as heat storage satisfied.

[0079] S3. Based on the photovoltaic power supply status, energy storage power supply status, water tank heat storage status, and rural housing heat use status, generate at least one of the following operating modes: photovoltaic direct drive mode, energy storage supplementary mode, water tank heat storage mode, and grid backup mode.

[0080] When the photovoltaic power generation meets the current operating power requirement of the air source heat pump host 4, the intelligent energy dispatcher 3 generates a photovoltaic direct drive mode. When the photovoltaic power generation exceeds the current operating power requirement of the air source heat pump host 4, and the lithium battery energy storage compartment 2 allows charging, the intelligent energy dispatcher 3 controls the surplus photovoltaic power to charge the lithium battery energy storage compartment 2 while generating the photovoltaic direct drive mode. When the photovoltaic power generation exceeds the current operating power requirement of the air source heat pump host 4, the lithium battery energy storage compartment 2 reaches the preset energy storage upper limit or the charging power is limited, and the integrated insulated water tank 5 is in a state of insufficient heat storage, the intelligent energy dispatcher 3 generates a water tank heat storage mode. When the photovoltaic power generation is less than the current operating power requirement of the air source heat pump host 4, and the remaining energy storage capacity is higher than the preset energy storage lower limit, the intelligent energy dispatcher 3 generates an energy storage supplement mode. When the photovoltaic power generation is less than the current operating power requirement of the air source heat pump host 4, and the remaining energy storage capacity is not higher than the preset energy storage lower limit, the intelligent energy dispatcher 3 generates a grid backup mode.

[0081] S4. In photovoltaic direct-drive mode, the intelligent energy dispatcher 3 controls the rooftop distributed photovoltaic array 1 to supply power to the air source heat pump host 4, enabling the air source heat pump host 4 to supply heat to the integrated insulated water tank 5. At this time, the compressor operating frequency of the air source heat pump host 4 is adjusted according to the temperature of the upper part of the water tank, the temperature of the lower part of the water tank, the domestic hot water demand information, and the heating demand information. When the temperature of the upper part of the water tank is lower than the preset domestic hot water temperature, the air source heat pump host 4 prioritizes supplementing heat to the upper part of the integrated insulated water tank 5; when the temperature of the upper part of the water tank is not lower than the preset domestic hot water temperature, and the temperature of the lower part of the water tank is lower than the preset heating and heat storage temperature, the air source heat pump host 4 supplements heat to the middle and lower parts of the integrated insulated water tank 5.

[0082] S5. In energy storage replenishment mode, the intelligent energy dispatcher 3 controls the lithium battery energy storage compartment 2 to supplement power to the air source heat pump host 4, enabling the air source heat pump host 4 to maintain heat supply to the integrated insulated water tank 5. In energy storage replenishment mode, the intelligent energy dispatcher 3 limits the compressor operating frequency of the air source heat pump host 4 according to the remaining energy storage power. When the remaining energy storage power is close to the preset lower limit value, the intelligent energy dispatcher 3 reduces the compressor operating frequency of the air source heat pump host 4 and prioritizes ensuring the outlet water temperature of the domestic hot water branch 6 and the basic circulation of the heating branch 7.

[0083] S6. In the water tank heat storage mode, the intelligent energy dispatcher 3 determines the heat storage capacity of the integrated insulated water tank 5 based on the upper temperature, lower temperature, and preset heat storage temperature of the water tank. When the heat storage capacity is greater than the preset heat storage capacity, and there is surplus photovoltaic power in the rooftop distributed photovoltaic array 1, the intelligent energy dispatcher 3 controls the air source heat pump host 4 to increase the compressor operating frequency and controls the integrated insulated water tank 5 to perform stratified heat storage. When the upper temperature of the water tank reaches the preset domestic hot water temperature, but the lower temperature of the water tank has not reached the preset heating heat storage temperature, the intelligent energy dispatcher 3 controls the air source heat pump host 4 to maintain heat storage in the middle and lower parts of the integrated insulated water tank 5. When the upper temperature of the water tank reaches the preset domestic hot water temperature, and the lower temperature of the water tank reaches the preset heating heat storage temperature, the intelligent energy dispatcher 3 reduces the compressor operating frequency of the air source heat pump host 4 or stops the air source heat pump host 4.

[0084] S7. In the grid backup mode, the intelligent energy dispatcher 3 controls the grid backup unit to supplement power to the air source heat pump host 4, and limits the heating priority of the air source heat pump host 4 according to the domestic hot water demand information and heating demand information. When the temperature of the upper part of the water tank is lower than the preset domestic hot water temperature, the intelligent energy dispatcher 3 controls the air source heat pump host 4 to prioritize supplementing heat to the upper part of the integrated insulated water tank 5. When the temperature of the upper part of the water tank is not lower than the preset domestic hot water temperature, and the temperature of the lower part of the water tank is lower than the preset heating and heat storage temperature, the intelligent energy dispatcher 3 controls the air source heat pump host 4 to supplement heat to the middle and lower parts of the integrated insulated water tank 5. When the temperature of the upper part of the water tank is not lower than the preset domestic hot water temperature, and the temperature of the lower part of the water tank is not lower than the preset heating and heat storage temperature, the intelligent energy dispatcher 3 controls the air source heat pump host 4 to reduce the compressor operating frequency, or controls the air source heat pump host 4 to enter standby mode.

[0085] S8, the intelligent energy dispatcher 3 controls the domestic hot water branch 6 to extract heat from the integrated insulated water tank 5 according to the domestic hot water demand information, and controls the heating branch 7 to extract heat from the integrated insulated water tank 5 according to the heating demand information.

[0086] Specifically, when the domestic hot water demand information indicates a domestic hot water demand, the intelligent energy dispatcher 3 controls the domestic hot water branch 6 to extract heat from the upper part of the integrated insulated water tank 5, and adjusts the operation status of the domestic hot water circulation pump and the opening degree of the domestic hot water regulating valve of the domestic hot water branch 6 according to the temperature of the upper part of the water tank. When the heating demand information indicates a heating demand, the intelligent energy dispatcher 3 controls the heating branch 7 to extract heat from the middle and lower part of the integrated insulated water tank 5, and adjusts the operation status of the heating circulation pump and the opening degree of the heating regulating valve of the heating branch 7 according to the temperature of the lower part of the water tank, the indoor ambient temperature, and the outdoor ambient temperature. When both domestic hot water demand information and heating demand information indicate a heating demand, the intelligent energy dispatcher 3 prioritizes ensuring the outlet water temperature of the domestic hot water branch 6, and then adjusts the water supply flow rate of the heating branch 7 according to the remaining heat storage capacity of the integrated insulated water tank 5.

[0087] S9. The intelligent energy dispatcher 3 corrects the heating parameters of the heating branch 7 based on the heat loss of the building envelope. The heat loss of the building envelope is determined based on the heat transfer coefficient of the building envelope insulation unit 8, the area of ​​the building envelope, and the temperature difference between the indoor and outdoor environments, and is corrected in conjunction with the decrease in indoor temperature per unit time. Specifically, the heat loss of the building envelope can be determined according to Qloss=K×A×(Tin-Tout), where Qloss is the heat loss of the building envelope, K is the heat transfer coefficient of the building envelope, A is the area of ​​the building envelope, Tin is the indoor temperature, and Tout is the outdoor temperature. The corrected heat loss of the building envelope can be determined according to Qloss,c=Qloss×(1+α×D), where Qloss,c is the corrected heat loss of the building envelope, α is the correction coefficient, and D is the decrease in indoor temperature per unit time. When the heat loss of the building envelope is lower than the preset heat loss threshold, it indicates that the insulation performance of the farmhouse is good or the current indoor heat loss is slow. The intelligent energy dispatcher 3 reduces the heating water supply temperature or the water supply flow rate of the heating branch 7. When the heat loss of the building envelope is not lower than the preset heat loss threshold, it indicates that the current heating load of the farmhouse is large. The intelligent energy dispatcher 3 increases the heating water supply temperature or the water supply flow rate of the heating branch 7. When the indoor ambient temperature drops slowly and the temperature at the bottom of the water tank can meet the heating demand of the heating branch 7, the intelligent energy dispatcher 3 reduces the water supply flow rate of the heating branch 7. When the indoor ambient temperature drops rapidly and the outdoor ambient temperature continues to drop, the intelligent energy dispatcher 3 increases the water supply flow rate of the heating branch 7 or increases the compressor operating frequency of the air source heat pump unit 4.

[0088] During operation at extreme low temperatures, the intelligent energy dispatcher 3 performs protective control based on the outdoor ambient temperature, remaining energy storage capacity, and water tank heat storage status. When the outdoor ambient temperature is lower than the preset low-temperature protection temperature, the intelligent energy dispatcher 3 assesses the remaining energy storage capacity and water tank heat storage status. When the remaining energy storage capacity is higher than the preset low-temperature discharge threshold, and the water tank heat storage status indicates that the integrated insulated water tank 5 has available heat storage capacity, the intelligent energy dispatcher 3 controls the lithium battery energy storage compartment 2 and the integrated insulated water tank 5 to jointly maintain basic heating for the domestic hot water branch 6 and the heating branch 7. Basic heating includes maintaining the minimum outlet water temperature of the domestic hot water branch 6, maintaining the minimum circulation flow rate of the heating branch 7, and initiating antifreeze circulation when the return water temperature of the heating branch 7 is lower than the preset antifreeze temperature. When the remaining energy storage capacity is not higher than the preset low-temperature discharge threshold, or when the water tank heat storage status indicates that the integrated insulated water tank 5 has no available heat storage capacity, the intelligent energy dispatcher 3 controls the grid backup unit to supply power to the air source heat pump host 4 and controls the air source heat pump host 4 to perform low-temperature supplementary heating operation. Low-temperature heat replenishment operation includes one or more of the following: increasing the operating frequency of the compressor of the air source heat pump host 4, extending the single operation time of the air source heat pump host 4, prioritizing heat replenishment to the upper part of the integrated insulated water tank 5, and controlling the intermittent circulation of the heating branch 7.

[0089] In this embodiment, the photovoltaic direct-drive mode, energy storage supplementary mode, water tank thermal storage mode, and grid backup mode are not absolutely independent of each other. During the day when there is sufficient sunlight and the farmhouse has a heating demand, the intelligent energy dispatcher 3 can simultaneously execute the photovoltaic direct-drive mode and the water tank thermal storage mode; when sunlight fluctuates and the lithium battery energy storage compartment 2 is allowed to discharge, the intelligent energy dispatcher 3 can simultaneously execute the photovoltaic direct-drive mode and the energy storage supplementary mode; when the temperature is extremely low and the remaining energy storage capacity is insufficient, the intelligent energy dispatcher 3 can execute the grid backup mode, prioritizing the basic heating supply to the domestic hot water branch 6 and the heating branch 7. The combined operation of the above modes is dynamically determined by the intelligent energy dispatcher 3 based on real-time operating data.

[0090] To avoid frequent switching of operating modes due to short-term fluctuations in photovoltaic power generation, the intelligent energy dispatcher 3 sets a minimum switching interval between two adjacent operating mode switches, preferably not less than 5 minutes. When the lithium battery energy storage compartment 2 switches between charging and discharging states, the intelligent energy dispatcher 3 adopts power ramp control, and the power change rate is preferably 10% to 20% of the rated power of the lithium battery energy storage compartment 2 per minute. When multiple operating modes are executed in parallel and have inconsistent requirements for the compressor operating frequency of the air source heat pump host 4, the intelligent energy dispatcher 3 prioritizes meeting the outlet water temperature and low-temperature protection requirements of the domestic hot water branch 6, and determines the target compressor operating frequency of the air source heat pump host 4 based on the larger value among the compressor operating frequencies corresponding to each operating mode, or based on the weighted value obtained from the weights of domestic hot water demand, heating demand, and heat storage demand.

[0091] If the heating parameters of heating branch 7 are not adjusted according to the heat loss of the building envelope, and it operates only according to a fixed heating water supply temperature or a fixed water supply flow rate, it is easy to cause indoor overheating and energy waste in farmhouses with good building envelope insulation, and easy to cause insufficient heating in farmhouses with poor building envelope insulation or rapid drop in outdoor ambient temperature. This embodiment links the heat loss of the building envelope with the graded heat extraction control of domestic hot water branch 6 and heating branch 7, so that domestic hot water branch 6 maintains independent temperature control, while heating branch 7 is dynamically adjusted according to the heat loss of the building envelope.

[0092] Through the above implementation methods, this invention combines the active power generation of the rooftop distributed photovoltaic array 1, the power peak shaving of the lithium battery energy storage compartment 2, the efficient heating of the air source heat pump host 4, the layered heat storage of the integrated insulated water tank 5, the graded heat extraction of the domestic hot water branch 6 and the heating branch 7, the passive energy saving of the building envelope insulation unit 8, and the unified control of the intelligent energy dispatcher 3. It can dynamically adjust the operation mode according to the photovoltaic power generation, the remaining power of the energy storage, the heat storage status of the water tank, and the heating status of the farmhouse, thereby improving the self-consumption capacity of the photovoltaic system, reducing the start-stop frequency of the air source heat pump host 4, improving the stability of the domestic hot water and heating supply of the farmhouse, and reducing the heating energy consumption of the farmhouse.

[0093] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for controlling the coordinated energy supply of solar power, energy storage, and thermal energy in zero-carbon rural housing, characterized in that, An application is made to a zero-carbon rural housing photovoltaic-thermal energy supply system, which includes a rooftop distributed photovoltaic array, a lithium battery energy storage compartment, an air source heat pump unit, an integrated insulated water tank, domestic hot water branches, heating branches, a building envelope insulation unit, a power grid backup unit, and an intelligent energy dispatcher. The control method includes the following steps: S1. The intelligent energy dispatcher collects the photovoltaic power generation of the rooftop distributed photovoltaic array, the remaining energy storage capacity of the lithium battery energy storage compartment, the outdoor ambient temperature, the indoor ambient temperature, the upper temperature of the integrated insulated water tank, the lower temperature of the integrated insulated water tank, domestic hot water demand information, heating demand information, the heat pump operation status of the air source heat pump host, and the grid connection status of the grid backup unit, and obtains the heat transfer coefficient and area of ​​the building envelope insulation unit. S2. Determine the photovoltaic power supply status based on the photovoltaic power generation capacity, determine the energy storage power supply status based on the remaining energy storage capacity, determine the water tank heat storage status based on the upper temperature and lower temperature of the water tank, determine the rural house heating status based on the outdoor ambient temperature, the indoor ambient temperature, the domestic hot water demand information and the heating demand information, and determine the heat loss of the building envelope based on the heat transfer coefficient of the building envelope, the area of ​​the building envelope, and the temperature difference between the indoor ambient temperature and the outdoor ambient temperature. S3. Based on the photovoltaic power supply status, the energy storage power supply status, the water tank heat storage status, and the rural housing heating status, generate at least one of the following operating modes: photovoltaic direct drive mode, energy storage supplement mode, water tank heat storage mode, and power grid backup mode. S4. In the photovoltaic direct drive mode, control the rooftop distributed photovoltaic array to supply power to the air source heat pump host, so that the air source heat pump host supplies heat to the integrated insulated water tank. S5. In the energy storage and replenishment mode, control the lithium battery energy storage compartment to supplement power to the air source heat pump host, so that the air source heat pump host continues to supply heat to the integrated insulated water tank. S6. In the water tank heat storage mode, control the air source heat pump host to increase the heat supply to the integrated insulated water tank and convert the surplus photovoltaic power into water tank heat storage. S7. In the grid backup mode, control the grid backup unit to supplement power supply to the air source heat pump host, and limit the heating priority of the air source heat pump host according to the domestic hot water demand information and the heating demand information. S8. Control the domestic hot water branch to extract heat from the integrated insulated water tank according to the domestic hot water demand information, and control the heating branch to extract heat from the integrated insulated water tank according to the heating demand information. S9. Correct the heating parameters of the heating branch according to the heat loss of the building envelope.

2. The zero-carbon rural housing solar-storage-thermal energy supply control method according to claim 1, characterized in that, In step S3, at least one operating mode is generated from the photovoltaic direct drive mode, the energy storage supplementary mode, the water tank thermal storage mode, and the grid backup mode, including: When the photovoltaic power generation meets the current operating power requirements of the air source heat pump host, the photovoltaic direct drive mode is generated; When the photovoltaic power generation is greater than the current operating power requirement of the air source heat pump host, and the remaining energy storage power is lower than the preset energy storage upper limit, the photovoltaic direct drive mode is generated, and the surplus photovoltaic power is controlled to charge the lithium battery energy storage compartment first. When the photovoltaic power generation is greater than the current operating power requirement of the air source heat pump host, the remaining energy storage power is not lower than the preset energy storage upper limit or the charging power of the lithium battery energy storage compartment is limited, and the integrated insulated water tank is in a state of insufficient heat storage, the water tank heat storage mode is generated. When the photovoltaic power generation is less than the current operating power requirement of the air source heat pump host, and the remaining energy storage power is higher than the preset energy storage lower limit, the energy storage replenishment mode is generated. When the photovoltaic power generation is less than the current operating power requirement of the air source heat pump host, and the remaining energy storage power is not higher than the preset energy storage lower limit, the grid backup mode is generated.

3. The zero-carbon rural housing solar-storage-thermal energy supply control method according to claim 1, characterized in that, In step S6, controlling the air source heat pump unit to increase the heat supply to the integrated insulated water tank includes: The heat storage capacity of the integrated insulated water tank is determined based on the temperature at the top of the water tank, the temperature at the bottom of the water tank, and the preset heat storage temperature. When the heat storage capacity is greater than the preset heat storage capacity, and there is surplus photovoltaic power generation, the air source heat pump host is controlled to increase the compressor operating frequency, and the integrated insulated water tank is controlled to perform stratified heat storage. When the temperature at the top of the water tank reaches the preset domestic hot water temperature, and the temperature at the bottom of the water tank does not reach the preset heating and heat storage temperature, the air source heat pump unit is controlled to maintain heat storage in the middle and lower parts of the integrated insulated water tank. When the temperature at the top of the water tank reaches the preset domestic hot water temperature and the temperature at the bottom of the water tank reaches the preset heating and heat storage temperature, the operating frequency of the compressor of the air source heat pump host is reduced or the air source heat pump host is stopped.

4. The method for controlling the coordinated solar-thermal energy supply of zero-carbon rural houses according to claim 1, characterized in that, In step S8, controlling the domestic hot water branch to draw heat from the integrated insulated water tank according to the domestic hot water demand information, and controlling the heating branch to draw heat from the integrated insulated water tank according to the heating demand information, includes: When the domestic hot water demand information indicates that there is a domestic hot water demand, the domestic hot water branch is controlled to extract heat from the top of the integrated insulated water tank, and the operating status of the domestic hot water circulation pump and the opening of the domestic hot water regulating valve of the domestic hot water branch are adjusted according to the temperature of the top of the water tank. When the heating demand information indicates that there is a heating demand, the heating branch is controlled to extract heat from the lower middle part of the integrated insulated water tank, and the operating status of the heating circulation pump and the opening degree of the heating regulating valve of the heating branch are adjusted according to the temperature of the lower part of the water tank, the indoor ambient temperature and the outdoor ambient temperature. When both the domestic hot water demand information and the heating demand information indicate a heating demand, priority is given to ensuring the outlet water temperature of the domestic hot water branch, and then the water supply flow of the heating branch is adjusted according to the remaining heat storage capacity of the integrated insulated water tank.

5. The method for controlling the coordinated energy supply of solar power, energy storage, and thermal energy in zero-carbon rural housing according to claim 1, characterized in that, In step S9, the heating parameters of the heating branch are corrected based on the heat loss of the building envelope, including: The heat loss of the building envelope is determined based on the heat transfer coefficient of the building envelope insulation unit, the area of ​​the building envelope, and the temperature difference between the indoor and outdoor ambient temperatures. The heat loss of the building envelope is then corrected by taking into account the decrease in the indoor ambient temperature per unit time. When the heat loss of the building envelope is lower than the preset heat loss threshold, the heating water supply temperature of the heating branch or the water supply flow rate of the heating branch is reduced. When the heat loss of the building envelope is not lower than the preset heat loss threshold, the heating water supply temperature of the heating branch or the water supply flow rate of the heating branch is increased.

6. The method for controlling the coordinated energy supply of solar power, energy storage, and thermal energy in zero-carbon rural housing according to claim 1, characterized in that, The air source heat pump unit includes a refrigerant circuit, which includes a compressor, a condenser, a dryer filter, an expansion valve, and an evaporator. The compressor, the condenser, the dryer filter, the expansion valve, and the evaporator are connected in sequence, and the dryer filter is located on the refrigerant inlet side of the expansion valve.

7. The method for controlling the coordinated energy supply of solar power, energy storage, and thermal energy in zero-carbon rural housing according to claim 6, characterized in that, The condenser has a refrigerant inlet, a refrigerant outlet, a water-side inlet, and a water-side outlet. The refrigerant inlet is located at the top of the condenser, the refrigerant outlet is located at the bottom of the condenser, the water-side inlet is located at the bottom of the condenser, and the water-side outlet is located at the top of the condenser, so that the refrigerant entering the condenser and the water entering the condenser form a countercurrent heat exchange.

8. The method for controlling the coordinated energy supply of solar power, energy storage, and thermal energy in zero-carbon rural housing according to claim 1, characterized in that, In step S7, the heating priority of the air source heat pump unit is determined based on the domestic hot water demand information and the heating demand information, including: When the temperature at the top of the water tank is lower than the preset domestic hot water temperature, the air source heat pump unit is controlled to prioritize supplementing heat to the top of the integrated insulated water tank. When the temperature at the top of the water tank is not lower than the preset domestic hot water temperature, and the temperature at the bottom of the water tank is lower than the preset heating and heat storage temperature, the air source heat pump unit is controlled to supplement heat to the middle and lower part of the integrated insulated water tank. When the temperature at the top of the water tank is not lower than the preset domestic hot water temperature and the temperature at the bottom of the water tank is not lower than the preset heating and heat storage temperature, the air source heat pump host is controlled to reduce the compressor operating frequency.

9. The method for controlling the coordinated energy supply of solar power, energy storage, and thermal energy in zero-carbon rural housing according to claim 1, characterized in that, The control method further includes: When the outdoor ambient temperature is lower than the preset low temperature protection temperature, the remaining power of the energy storage and the heat storage status of the water tank are determined. When the remaining energy storage capacity is higher than the preset low temperature discharge threshold, and the water tank heat storage status indicates that the integrated insulated water tank has available heat storage capacity, the lithium battery energy storage compartment and the integrated insulated water tank are controlled to jointly maintain the basic heating of the domestic hot water branch and the heating branch. When the remaining energy storage power is not higher than the preset low temperature discharge threshold, or when the water tank heat storage status indicates that there is no available heat storage in the integrated insulated water tank, the power grid backup unit is controlled to supply power to the air source heat pump host, and the air source heat pump host is controlled to perform low temperature heat replenishment operation.

10. A zero-carbon rural housing solar-storage-thermal co-generation energy supply system, characterized in that, It includes rooftop distributed photovoltaic arrays, lithium battery energy storage compartments, air source heat pump main units, integrated insulated water tanks, domestic hot water branch lines, heating branch lines, building envelope insulation units, power grid backup units, and intelligent energy dispatchers; The rooftop distributed photovoltaic array is electrically connected to the lithium battery energy storage compartment and the air source heat pump unit, respectively. The lithium battery energy storage compartment is electrically connected to the air source heat pump main unit. The power grid backup unit is electrically connected to the air source heat pump main unit; The air source heat pump unit is thermally connected to the integrated insulated water tank; The integrated insulated water tank is connected to both the domestic hot water branch and the heating branch. The insulation unit of the building envelope is installed in the building envelope of the farmhouse. The intelligent energy dispatcher is communicatively connected to the rooftop distributed photovoltaic array, the lithium battery energy storage compartment, the air source heat pump unit, the integrated insulated water tank, the domestic hot water branch, the heating branch, and the power grid backup unit. The intelligent energy dispatcher is configured to: generate at least one of the following operating modes based on the photovoltaic power generation, the remaining energy storage capacity, the water tank heat storage status, and the rural housing heating status: photovoltaic direct drive mode, energy storage supplement mode, water tank heat storage mode, and power grid backup mode; control the domestic hot water branch and the heating branch to extract heat in stages; and correct the heating parameters of the heating branch based on the heat loss of the building envelope. The intelligent energy dispatcher is used to execute the zero-carbon rural housing photovoltaic-storage-thermal collaborative energy supply control method according to any one of claims 1 to 9.

11. A zero-carbon rural housing solar-storage-thermal co-generation energy supply system according to claim 10, characterized in that, The air source heat pump unit includes a refrigerant circuit, which includes a compressor, a condenser, a dryer filter, an expansion valve, and an evaporator. The compressor, the condenser, the dryer filter, the expansion valve, and the evaporator are connected in sequence, and the dryer filter is located on the refrigerant inlet side of the expansion valve.

12. A zero-carbon rural housing solar-storage-thermal co-generation energy supply system according to claim 11, characterized in that, The condenser has a refrigerant inlet, a refrigerant outlet, a water-side inlet, and a water-side outlet. The refrigerant inlet is located at the top of the condenser, the refrigerant outlet is located at the bottom of the condenser, the water-side inlet is located at the bottom of the condenser, and the water-side outlet is located at the top of the condenser, so that the refrigerant entering the condenser and the water entering the condenser form a countercurrent heat exchange.

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